Resistor colour code, read either way BANDS
Yellow, violet, red, gold is 4.7 kΩ ±5%. Pick the bands to read a value, or type a value to see its bands, and be told when a reading is not a value anyone makes.
Read the bands
Hold the resistor with the band that stands apart from the others on the right: that is the tolerance, and it is usually gold, silver or brown. Gold and silver are never the first band. Under warm light, red, orange and brown are the ones most often mistaken for each other.
Find the bands for a value
The working
The colour code is IEC 60062: digits black 0 to white 9, gold and silver as multipliers of 0.1 and 0.01 (pink, 0.001, since 2016), and tolerances brown 1%, red 2%, green 0.5%, blue 0.25%, violet 0.1%, gold 5%, silver 10% and no band 20%. Preferred values are the E-series of IEC 60063.
How it works
BANDS reads the colour bands on a four, five or six-band resistor as a value, tolerance and temperature coefficient, using the IEC 60062 code, and works the other way from a value to its bands. It says whether the value is a preferred one in the E12, E24, E48 or E96 series, which is the quickest way to catch a misread band. Nothing leaves this tab.
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